Why is there a Role I can't remove or modify?

This has to do with Permission Inheritance.  The Inheritance must be "broken" in order to edit it.

How to Setup a page for Everyone and Not Authenticated Users to view.

One of the security setups that will be used primarily for the public facing 

  1. From the Users and Roles section, select the Everyone role
Note: For the Not Authenticated Users role, the set up is exactly the same as the Everyone role
  1. Under the Access Rights section on the right, check the box beside Read under the Allow column.
  2. At the bottom
    • Requires Authentication: select Inherits (No)
    • Requires SSL: select Inherits (Never)
  3. Click on Save to confirm your changes.

How to setup a page for Members only to view

If you would like to have a page on your site only viewed by your Membership or any authenticated user, the appropriate page security will need to configured. To configure this setup you will need to follow these steps:

  1. From the Users and Roles box, select the Members role
  2. Under the Access Rights section on the right, check the box beside Read under the Allow column.
  3. At the bottom 
    • Requires Authentication: select Yes
    • Requires SSL: select Inherits (Never)
  4. Click on Save to confirm your changes.